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Re:Mathigon – an interactive, personalized mathematics textbook by gubikmic on Sunday March 24, 2019 @05:22PM (#19478854)
Re:Mathigon – an interactive, personalized mathematics textbook by lovemenot on Sunday March 24, 2019 @10:29PM (#19479929)
there's no license file at the link above. I believe this software is mainly intended for the use of educators to develop new content locally.

It seems there's a separate account for their MIT licensed software: https://github.com/mathigon/mathigon.github.io